Managing Geotechnical Risk through Non-Destructive Rock ...

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tests for more than 20 years [5]. Integrity Testing PTY LTD (i.e. developers of the Modshock system) has for over 15 years carried out testing of long length steel rods, either as strand or solid steel bars. The most notable project was for BHP, when they owned the Whyalla steel works where they tested the tie rods holding back the crucial steel pile wall of the coal handling jetty. The rods were tested and not only were the defective rods identified but it was indicated at what point the rods had lost a large cross section. This was located at a point where the rods came close to the base of the coal handling pit and water was seeping onto the rods causing corrosion. Thus a large successful background in the testing of steel embedded elements, generally with the lengths in excess of 5 meters. CALIBRATION TESTING PROGRAM AT GEORGE FISHER MINE The bolts tested at George Fisher Lead-Zinc Mine consisted of: i) Cable Bolts ii) iii) Resin Bolts and Friction Stabiliser Bolts. i) Cable Bolts (Figure 3 – Table 1) The cable bolts tested were: 6m and 8m Single Strand Cable Bolts – One bulb per meter. 6m and 8m Twin Strand Cable Bolts - One bulb per meter. ii) Resin Bolts (Figure 4 and Table 2) The resin bolts tested were: 2.2m Thread Bar Posimix. 8
iii) Friction Bolts (Figure 5 and Table 3) The friction bolts tested were: 2.4m Friction Bolt, 47mm diameter. Test Site Locations The site testing was conducted on the 8 th September 2009 and 16 th October 2009. The following sites were selected by Mr. Fred Harvey (<strong>Rock</strong> Mechanics Superintendent): 6 Level 5053 EXC – Calibration Tests for Cable Bolts, Resin bolts and Friction Bolts. 16 Level – Tests for grouted and resin solid bars (Test results not part of this paper). 6 Level 5053 East Crosscut Calibration Tests Set-up Table 4 and Figure 6 provide information regarding the Single Strand Cable bolt calibration set-up. Table 5 and Figure 7 provide information regarding the Twin Strand Cable bolt calibration set-up. Table 6 and Figure 8 provide information regarding the Resin Bolt calibration set-up. Table 7 and Figure 9 provide information regarding the Friction (Splitset) Bolts calibration set-up. 9
Page 1 and 2: Second Ground Control in Mining Con
Page 3 and 4: ABSTRACT Corrosion affects the perf
Page 5 and 6: (i) Boltometer Instrument can be us
Page 7: could have been useful to them beca
Page 11 and 12: (i.e. bolt necking, bolt volume red
Page 13 and 14: Test No 13 and 9 showed that full c
Page 15 and 16: Test 29 was a full 2.2m long bolt w
Page 17 and 18: CONCLUSIONS The non-destructive cal
Page 19 and 20: ACKNOWLEDGEMENTS The authors would
Page 21 and 22: Fig 15 - 2D Plot for Twin Strand Ca
Page 23 and 24: Fig 3 - Cable Bolt Diagram. Fig 4 -
Page 25 and 26: Fig 9 - Schematic illustrating resi
Page 27 and 28: Fig 13 - 2D Plot for Single Strand
Page 29 and 30: Fig 17 - 2D Plot for Resin Bolt Tes
Page 31 and 32: Fig 21 - 2D Plot for Splitset Test
Page 33 and 34: Table 3 - Mechanical Properties for
Page 35 and 36: Bolt Test Test Date Hole Length Hol
Page 37 and 38: Test Element Test Number Bolt Type

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